Long-term pattern of lake ecosystem in response to eutrophication and water regulation in Chenghai Lake, Yunnan, China

doi:10.13287/j.1001-9332.202005.037

Abstract

Abstract: In the context of catchment development and climate change, anthropogenic activities have significantly altered the succession and functioning of freshwater ecosystems. Combining the sedimentary records and modern survey data, we reconstructed a 250-year history of ecological changes in Chenghai Lake, aiming to assess the long-term ecological changes in Changhai Lake in response to multiple environmental stresses, such as eutrophication and hydrological fluctuation.Three stages were identified for the process of nutrient enrichment leading to a long-term increase in primary production. Nutrient level was relatively low before 1970, increased gradually between 1970 and 2000, with an accelerating increase after 2000. The water regulation project enhanced water turbulence and river flux during 1993—2000, which promoted the growth of turbulence-tolerant Aulacoseira and influx of benthic Nitzschia. The organic carbon cycling in Chenghai Lake was mainly driven by the autogenetic inputs. The eutrophication process dominated the long-term shifts of diatom assemblages followed by hydrological fluctuation. Our results illustrated that ecological restoration and catchment management of Chenghai Lake not only need to focus on the control of nutrient enrichment and pollutant input, but also should consider hydrological regulation and water level fluctuation.

Key words: Chenghai Lake, sediment, diatoms, lake-water total organic carbon, eutrophication, water regulation

LIU Yuan-yuan, CHEN Guang-jie, HUANG Lin-pei, CHEN Zi-dong, HUANG Guang-cai, LIU Xiao-long, LI Rui. Long-term pattern of lake ecosystem in response to eutrophication and water regulation in Chenghai Lake, Yunnan, China[J]. Chinese Journal of Applied Ecology, 2020, 31(5): 1725-1734.

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